A book seller allowed 10 % discount on printed price. He gets 30 % commission from publisher. His profit in percent will be? 

Population of a city is 7000. In next year the population is increased by 8%, then find the new population?

A man gives 20% of his money to his eldest son, 30% of remaining he gives to his younger son. 10% of the remaining he gives in a school for poor boys still he has Rs.100.80. Find his total sum. 

There are 80 students in a class out of these 15% are girls. The monthly fee of each girl is Rs.350 and monthly fee of each boy is 38% more than each girl. What is the total fee of girls and boys in the class?

A number, on subtracting 15 from it reduces to its 80 %. What is 40 % of the number? 

A man's annual income has increased by Rs. 5 lakhs but the tax on income that he has to pay has reduced from 12 % to 10 %. He now pays Rs. 10,000 more income tax. What is his increased income (in Rs. lakhs)? 

Tonu invested 10 % more than the investment of Monu and Sonu invested 10 % less than the investment of Monu. If the total investment of all the three persons is ₹ 60, 000, the investment of Monu is – 

Two numbers are respectively 20% and 50% of a third number. What percent is the first number of the second?